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PubMed1989

Osteoarthritis in the hand: a comparison of handedness and hand use.

Osteoarthritis (OA) of the hand has been suggested to be the result of "wear" and "tear." If so, OA should develop more frequently in the dominant hand. We compared dominant with nondominant hands of 134 consecutive community subjects aged 53-75 by questionnaire, radiographs of hands, and rheumatologic evaluation. Mean age was 60 years, 93% were right handed, and 95% were in occupations classified as nonphysical. Subjects estimated dominant hand use of 2-10 times the amount of the nondominant hand. OA was found in 133 of 134 subjects. No radiologic or clinical differences were found between the dominant and nondominant hands. Twenty-six subjects who self-reported heavier lifetime hand use had somewhat greater clinical and hand radiographic OA scores than the 36 subjects reporting lighter hand use (43.5 vs 34.5) (p less than 0.01). In our study population, OA was not more prevalent in the dominant hand.

Aged↗
PubMed1987

[Assessment of handedness using finger spreading].

In 50 right handed and 50 left handed subjects we researched the phenomenon of spreading fingers. In the right hand of right-handers we found the smallest angels between fingers, in the right hand of left-handers we found the biggest angels between the spreaded fingers. The higher the dominance of the hand, the lower is the phenomenon of spreading fingers. We assumed smaller motor units at the side of dominance.

Adult↗
PubMed1986

Handedness, footedness and finger and toe movement-related cerebral potentials.

Sixteen right-handed and 16 left-handed subjects were compared with respect to their foot dominance and the topography of their pre-movement cerebral potentials (Bereitschaftspotential, BP). First, righthanders were usually also found to be right-footed. Lefthanders showed a similar trend in preferring their left foot. Second, the BP prior to volitional self-paced movements of fingers and toes on either side was examined. For finger movements, the BP always showed higher amplitudes over the contralateral hemisphere as compared to the ipsilateral one (contralateral preponderance of negativity, CPN). For toe movements a significant ipsilateral preponderance of negativity (IPN) occurred in all subjects. The CPN was larger for finger movements of the dominant hand than it was for finger movements on the non-dominant side. By contrast, the IPN was larger prior to movements of the "non-dominant toes" than it was for movements of the dominant toes. This can be explained by assuming that the hemisphere contralateral to the dominant hand, generates more negativity than the one contralateral to the non-dominant hand. This assumption is further discussed in the context of a vector model for the BP.

Adolescent↗